JPS61109917A - Clutch - Google Patents

Abstract

PURPOSE:To secure synchronizing capacity which is sufficient to changeover for two wheel-four wheel, by providing a cam device, which moves a clutch ring to a rotor side in a thrustward direction through a relative deviation between the clutch ring and an input shaft, between both. CONSTITUTION:A clutch ring 9 which is supported rotatably by an input shaft 1 and movable and operatable in a thrustward direction is arranged on one side of a chain wheel 5 in the thrustward direction of the same, and a clutch device 11 performing friction joining of a chain wheel 5 and clutch ring 9 by a movement of the clutch ring 9 to a chain wheel 5 side in the thrustward direction is provided between both. A cam device 13 moving the clutch ring 9 to a chain wheel 5 side in the thrustward direction through a relative deviation between the clutch ring 9 and input shaft 1 is provided between both.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a clutch device used for switching between two wheels and four wheels of a four-wheel drive vehicle.

[Technical background and problems] Conventional clutch devices of this type include, for example, the one described in Jidosha Engineering, January 1981 issue, page 72 (Published on January 1, 1981 by Railway Japan Co., Ltd.). There is something. This is a transfer device in which spline parts are formed on both the input shaft side and the chain wheel as a rotating body on the output shaft side, and a sleeve for switching between 2 wheels and 4 wheels connects and disconnects the two. This allows the power transmission from the input shaft to the rotating body to be intermittent.For this reason, a synchronizing mechanism is required to synchronize the input side and the rotating body when switching connections during running. However, this type of device generally uses an inertia lock type synchronizer mechanism used in transmissions, but it is not suitable for switching between two wheels and four wheels in a four-wheel drive vehicle, for example. Since there are many parts to be synchronized, such as the propeller shaft of the differential device and the axle shaft, the synchronizing capacity is not sufficient and there is a risk of seizure.

[Purpose of the Invention] This invention was devised in view of the above-mentioned problems, and provides an approach to ensure sufficient synchronizing capacity to switch between two wheels and four wheels while driving, and to ensure reliable connection during rotation. The purpose is to provide a clutch device that can do the following.

[Structure of the Invention] In order to achieve the above object, the present invention includes an input shaft that receives rotational force from a drive device, an output-side rotating body rotatably supported by the input shaft, and an output-side rotating body that can be operated to move in a thrust direction. a clutch ring, a clutch means formed between the rotary body and the clutch ring to frictionally engage the two by moving the clutch ring toward the rotary body in the thrust direction, and a clutch means formed between the clutch ring and the input shaft to engage the two by friction. The clutch ring is configured to include a cam means that moves the clutch ring toward the rotating body in the thrust direction by relative displacement.

C Example j Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 shows a 2-wheel-to-4-wheel switching portion of a transfer device used in a 4-wheel drive vehicle according to a first embodiment of the present invention. The input shaft 1 is rotatably supported by a transfer case (not shown) via a bearing 3, and is configured to receive rotational force from an engine serving as a drive device (not shown). A chain wheel 5 serving as an output-side rotating body is rotatably supported on the input shaft 1.

The position of the chain wheel 5 in the thrust direction is regulated by the stepped portion 1a of the input shaft 1 and the circlip 7. A chain (not shown) is wound around the chain wheel 5, so that power can be transmitted to the front wheels.

On the other hand, a clutch ring 9 rotatably supported by the input shaft 1 is arranged on the negative side of the chain wheel 5 in the thrust direction. A circumferential groove 9a is provided on the outer periphery of this clutch ring 9.
A fork (not shown) is engaged with the fork, and the fork can be operated by an operating lever. Therefore, the clutch ring 9 is configured to be movable in the thrust direction.

Between the chainwheel 5 and the clutch ring 9, there is a thrust direction chainwheel 5 of the clutch ring 9.
Clutch means 11 that frictionally engages the two by moving to the side.
is provided. This clutch means 11 is composed of an outer cone surface 11a provided on the clutch ring 9 and an inner cone surface 11b provided on the chain wheel 5.

A cam means 1 is provided between the clutch ring 9 and the input shaft 1.
3 is provided. The cam means 13 is fitted with a plurality of cam projections 13a provided in the same direction on the side surface of the clutch ring 9, and is fitted with a plurality of cam recesses 13b formed in the flange portion 1b of the input shaft 1. It consists of Therefore, the cam means 13 is configured to move the clutch ring 9 toward the chain wheel 5 in the thrust direction by the relative displacement between the clutch ring 9 and the input shaft 1.

Note that a rear wheel drive shaft (not shown) is connected to the input shaft 1 for transmitting power to the rear wheels.

Next, let's talk about the operation of the first embodiment.

When the clutch ring 9 is not moved and the clutch means 11 is not engaged, the driving force of the input shaft 1 is not transmitted to the chain wheel 51\, but only to the rear wheel drive shaft side l\. Therefore, the vehicle can be driven in two-wheel drive.

When the vehicle enters a rough road and it becomes necessary to switch to four-wheel drive while driving, a fork (not shown) is moved by an operation lever (not shown), and the clutch ring 9 is moved toward the chain wheel 5 side. This movement causes the clutch means 11
The outer cone surface 11a and the inner cone surface 11b are frictionally engaged. Initially, the fastening force is weak and the two slip, but the clutch ring 9 receives resistance from the chain wheel 5 side, causing a relative shift between the chain wheel 5 and the input shaft 1.

Therefore, the cam protrusion 13a receives a pressing force from the cam recess 13b, and the clutch ring 9 is moved toward the chain wheel 5 in the thrust direction. This movement causes the outer cone surface 11
The fastening force between a and the inner cone surface 11b is strengthened, and a reaction force acts on the cam means 10. Thereafter, the clutch means 11 is reliably engaged by the servo action, and as a result, the input shaft and the chain wheel 5 are smoothly connected. Therefore, the vehicle can switch between four-wheel drive modes even while driving, making it easy to drive on sales channels.

FIG. 3 shows a second embodiment of the present invention, which is provided with an auxiliary spline connection means 21 consisting of a first spline portion 15 on the input shaft 1 side, a second spline portion 17 on the chain wheel 5 side, and a sleeve 19. It is.

It is preferable that the movement of the sleeve 19 is linked to an operating lever for operating the clutch ring 9, so that the movement of the clutch ring 9 is delayed when it is engaged, and is moved simultaneously or before the movement of the clutch ring 9. However, it is not limited to this. In this second embodiment, the connection becomes even more reliable. Other structural functions are substantially the same as those of the first embodiment, so the same reference numerals are given and explanations thereof will be omitted.

Note that this invention is not limited to the above embodiments. For example, the clutch means can also be constituted by a multi-disc clutch. Further, the present invention can also be applied to gear transmissions and the like.

[Effects of the Invention] As is clear from the above, according to the configuration of the present invention, the I! of the clutch means can be controlled by the clutch ring moving operation even during rotation. The input shaft and the rotating body can be reliably connected through the J-friction connection, and a strong connection can be obtained by the servo action of the cam means. Therefore, the problems caused by the conventional synchronization mechanism can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the invention, FIG. 2 is a sectional view of a cam means, and FIG. 3 is a sectional view of a second embodiment. 1... Input shaft 5... Chain wheel rotating body 9... Clutch ring 11... Clutch means 13...-Cam means-
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Claims (1)

[Claims] An input shaft receiving rotational force from a drive device, an output-side rotating body rotatably supported by the input shaft, a clutch ring operable to move in a thrust direction, and a clutch ring formed between the rotating body and the clutch ring. a clutch means that frictionally engages the clutch ring by moving it toward the rotating body in the thrust direction; and a cam that is formed between the clutch ring and the input shaft and moves the clutch ring toward the rotating body in the thrust direction by a relative shift between the two. A clutch device comprising a means and more.